Chosen Solution
My MBP screen went white (ultra low contrast) and has since had a white vignetting around screen. Possible bad gfx card? I have turned off switching. Use professionally. MacBook Pro (Retina, 15-inch, Mid 2014) NVIDIA GeForce GT 750M 2048 MB Intel Iris Pro 1536 MB
Using this tool you can turn off the discreet GPU to test out if that is the issue gfxCardStatus
